I searched for this application in mate 20.04.02, also in the boutique, but it seems to no longer exist.
Alternatives? 
If I understand your demand correctly, you need application with window name Make startup disk
create a startup disk using a CD or disc image (for GNOME)
from usb-creator-gtk package.
To install it open terminal and type:
sudo apt-get install usb-creator-gtk
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Exactly, thanks. The confusion arises from the translation of the application name. Before, the package was installed by default, strange not to find it even in the boutique and not even in synaptics.
Bye!
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Hi @HighMate,
In a laptop with Ubuntu MATE 18.04.5 that I upgraded to Ubuntu MATE 20.04.2, the application is called "Startup Disk Creator" (with the tooltip text "Create a startup disk using a CD or disc image") and it is available in the "Administration" menu. Let me include here a screenshot to better illustrate where it is:
I see that "Startup Disk Creator" icon, in my machine, is associated with the command usb-creator-gtk like @Norbert_X has also mentioned. Screenshot of the "Startup Disk Creator" Properties window:
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